Unable to format text (bold, italic, insert link, etc)

Just as the title says. I've added a screenshot. The text formatting toolbar is missing. And this time, it's not a browser cache issue. I've done everything I could (clearing ALL sorts of cache, restarting EVERYTHING, etc.). The "More Options" button doesn't help either. Same with IE9. I'm now using Firefox. Is it just me, or it's gone?